N356KD

Part: PUMP — CORRODED (ZONE 100) · corrosion level 2 · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK EVIDENCE OF CORROSION AROUND RIGHT CENTER TANK JETTISON PUMP. WORK ACCOMPLISHED IAW AGREEMENT NR WGN-RE-2500580. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: ACOUSTIC LINER — CORRODED (ZONE 400) · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK CORROSION SIGNS UNDER ACOUSTIC LINER ENGINE #2 POSITION 3 AND 6 O'CLOCK (REPIAR). CORROSION IN ACOUSTIC INNER LINER ENGINE #2 POSITION 3 AND 6 O'CLOCK WAS CLEANED IAW B747-400F AMM 51-00-53. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: PITOT TUBE — CORRODED (ZONE 200) · corrosion level 2 · airframe 83,500 hrs · 17,029 cycles

NR# 267 - DURING HEAVY MAINTENANCE CHECK RH LOWER PITOT-STATIC PROBE SIGNS OF CORROSION. REMOVED AND REPLACED RH LOWER PITOT-STATIC PROBE IAW B747-400F AMM 34-11-01. TEST SATISFACTORY. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: PITOT TUBE — CORRODED (ZONE 200) · corrosion level 2 · airframe 83,500 hrs · 17,029 cycles

NR# 264 - DURING HEAVY MAINTENANCE CHECK LH UPPER PITOT-STATIC PROBE SIGNS OF CORROSION. REMOVED AND REPLACED LH UPPER PITOT -STATIC PROBE IAW B747-400F AMM 34-11-01. TEST SATISFACTORY. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: PITOT TUBE — CORRODED (ZONE 200) · corrosion level 2 · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK LH LOWER PITOT-STATIC PROBE SIGNS OF CORROSION. REMOVED AND REPLACED LH LOWER PITOT-STATIC IAW B747-400-F AMM 34-11-01. TEST PASS. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: PITOT TUBE — CORRODED (ZONE 200) · corrosion level 2 · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK RH UPPER PITOT-STATIC PROBE SIGNS OF CORROSION. REMOVED AND REPLACED RH UPPER PITOT-STATIC PROBE IAW B747-400F AMM 34-11-01. TEST PASS. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: FASTENER — CORRODED (ZONE 200) · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BETWEEN STA 1240 AND 1260 RH SIDE FASTENER CORRODED. REMOVED AND REPLACED FASTENERS AT CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BTWN STA 1240 AND 1260 RH SIDE IAW B747-400F SRM 51-40-02-06-0. THE AIRCRAFT WAS APPPROVED FOR RETURN TO SERVICE.

Part: PRESSURE DECK — CORRODED (ZONE 200) · airframe 83,500 hrs · 17,029 cycles

DURING HEAVY MAINTENANCE CHECK CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BETWEEN STA. 1240 AND 1260 LH SIDE SOME FASTENERS CORRODED. REMOVED AND REPLACED FASTENERS AT CENTER FUSELAGE UNDERNEATH FLOOR BOARD CANTED PRESSURE DECK BETWEEN STA 1240 AND 1260 LH SIDE IAW B747-400F SRM 51-40-02-00. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: SKIN — DAMAGED (ZONE 100) · airframe 83,500 hrs · 17,029 cycles

NR# 13 - DURING HEAVY MAINTENANCE CHECK EXTENSIVE FUSELAGE DAMAGE LH SIDE BELOW CREW CABIN (STORM DAMAGE). REFERENCE BOEING REPAIR ORDER WGN-RE-2403216 FOR CORRECTIVE ACTION, DATED 8/24/25. REFERENCE 337 FOR CORRECTIVE ACTION DATED 7/31/25. REFERENCE 8100-9 ISSUED FROM BOEING DATED 8/24/25 FOR CORRECTIVE ACTION. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.

Part: HMU — INOPERATIVE (#2 ENGINE) · airframe 82,652 hrs · 16,899 cycles

DISCREPANCY: ENGINE #2 FAILURE ON SHORT FINAL. CORRECTIVE ACTION: REMOVED AND REPLACED HMU IAW B747 AMM 73-21-14. #2 ENGINE RUN SUCCESSFUL. NO LEAKS NOTED.

Part: UNKNOWN — UNKNOWN (UNKNOWN) · airframe 82,572 hrs · 16,888 cycles

DISCREPANCY: DURING HIGH-SPEED PORTION OF TAKEOFF ROLL, ENGINE 1 OVERTEMP. DURING CLIMB ENGINE 2 OVERTEMP. CORRECTIVE ACTION: PERFORMED ENGINE OVERTEMP INSPECTION OF ENGINE 1 & 2 IAW 72-00-00. NO DEFECTS NOTED, ENGINE OK FOR SERVICE.

Part: CONTROL UNIT — BROKEN (ZONE 100) · airframe 80,406 hrs · 16,489 cycles

THRUST LEVERS NON-RESPONSIVE WHEN MANUALLY INCREASED WITH AUTO THROTTLES ENGAGED. AP FAIL / AUTO THROTTLES FAIL. R & R #2 BCU IAW MM 24-23-01. AUTO LAND/AUTO THROTTLES NOW SATIS. OPS TEST OF FCC, L,C,R IAW MM 22-10-00 PASS TEST SATIS. TEST OF FMC AND FMC SERVO LOOP FOR AUTO THROTTLE SYSTEM PASS SATIS IAW MM 34-61-00.

Part: BRACKET — BROKEN (NR 4 ENGINE) · airframe 80,290 hrs · 16,469 cycles

AIR RETURN BACK TO LAX DUE TO ENGINE 4 SURGE. ENGINE 4 SURGED MULTIPLE TIMES DURING CRUISE, SURGE WAS INTERMITTENT. PERFORMED SURGE CHECKLIST. REMOVED AND REPLACED VSV ACTUATOR LEVER PIVOT BRACKET & BOLT/STUD AS PER AMM 72-36-00. OPS CHECK GOOD.

Part: FILTER — DIRTY (NR 4 ENGINE) · airframe 80,278 hrs · 16,467 cycles

ENGINE 4 FUEL FILTER EICAS INTERMITTENT. ENGINE 4 SURGES INTERMITTENTLY.

Part: LANDING GEAR — MALFUNCTIONED (NOSE) · airframe 78,087 hrs · 16,037 cycles

NOSE LANDING GEAR WOULD NOT RETRACT, GEAR DISAGREE AND GEAR DOOR EICAS ON DEPARTURE. AIR RETURN.

Part: WARNING MESSAGE — ILLUMINATED (MLG) · airframe 75,339 hrs · 15,560 cycles

"GEAR DOOR" EICAS MESSAGE ON DEPARTURE - WITH VIBRATION CYCLED GEAR - GOT "GEAR DISAGREE" MESSAGE. NOSE GEAR NOT DOWN. LOCKED ALL LANDING GEAR IN DOWN POSITION AND TRANSFERRED TO DMI #11558 IAW MEL 32-30-01 PLACARDS INSTALLED. REPOSITIONED TO KOSC FOR REPAIRS.

Part: LINE — LEAKING (OXYGEN SYSTEM) · airframe 74,148 hrs · 15,350 cycles

AFTER TWO HOURS OF FLIGHT, CREW OXYGEN LOW MESSAGE OXYGEN CONTINUOUSLY DECREASED DURING FLIGHT AS LOW AS 370 PSI. REPLACED OXYGEN LINE AT THE BOTTLE. LEAK CHECK PERFORMED IAW AMM 35-11-00.

Part: TENSION TIE — MISLOCATED (BS 1160-1200) · airframe 73,546 hrs · 15,270 cycles

TENSION TIES FRAME STA 1160&1200 BETWEEN L/RBL48-L/RBL70 STA 1200-THE DWG REQUIRES 47 FASTENERS HOLES DIA 1/4" ON EACH SIDE BUT 55 HOLES WERE DRILLED. STA 1160-THE DWG REQUIRES 53 FASTENERS HOLES DIA 1/4" ON EACH SIDE BUT 59 HOLES WERE DRILLED

Part: SLIDE — DEFECTIVE (CABIN) · airframe 71,979 hrs · 15,063 cycles

UPPER DECK RT ESCAPE SLIDE INADVERTENTLY DEPLOYED. SLIDE DID NOT FULLY DEPLOY. DOOR ARMED, NO MECHANICAL DEFECT. REMOVED SLIDE AND DEFERRED SYSTEM.

Part: WARNING SYSTEM — ACTIVATED (COCKPIT) · airframe 71,325 hrs · 14,958 cycles

THE FLIGHT CREW REPORTED, THROUGHOUT FLIGHT AN INDICATION OF ANTI-SKID FAULT AND NR 4 HYDRAULIC SYSTEM LOW QUANTITY, DECLARED EMERGENCY LANDING INTO ANC.

Part: SKIN — CORRODED (RT HORIZ STAB) · corrosion level 2 · airframe 68,255 hrs · 14,372 cycles

RT HORIZONTAL STABILIZER UPPER SKIN IS CORRODED AT STAB STATION 150 STRINGER 15 & 16.

Part: SKIN — CHAFED (BS 2484) · airframe 68,255 hrs · 14,372 cycles

FUSELAGE SKIN PANEL UNDERNEATH THE RT HORIZONTAL STABILIZER AT BS 2484 HAS EVIDENCE OF CHAFING STRINGERS 16 TO 20R.